Using the computers that surround them, the accelerator operators can monitor the status of the accelerator. If a cavity isn't quite running as well as it should, they can tune it. If more Liquid Helium is needed, they can ask the Central Helium Liquefier for more. If the beam starts to wander from the center of the beam pipe, they can adjust it with the steering magnets. It's sort of like a big video game, but they get paid to play!